the coolant you see bubbling in the video is just excess water from when i was rinsing the motor down from its first explosion of water from the radiator neck.

@EchoSixMike, no they didn't pressure test them, just a magnaflux twice

@GTXMatt no tstat, just finished the break in process and was still having this coolant issue, the radiator is a 18" high by 24" wide HD 2 core from a ramcharger, and no i didn't have the cap on when it first puked, wp/alt belt on, tried it again the first time before pulling the heads with cap on and it pissed out the over flow tube hook up, gonna go try another new rad cap and see if the china/mexico junk motorad one was just a turd,

-Mike